Integrated electrode arrangement and data acquisition system for fracturing monitoring

Abstract

The utility model relates to the field of oil and gas fracturing monitoring, in particular to an integrated electrode array for fracturing monitoring, which comprises an array wire formed by bundling at least two conductive wires, the number of the electrodes is equal to that of the conductive wires of the arrangement wire; furthermore, each of the at least two conductive wires has an independent characteristic representation, and the electrodes are respectively connected with specific conductive wires according to an arrangement order. The integrated electrode array is clustered into one through a plurality of conductive wires, and each conductive wire is endowed with characteristic representation so as to be connected with the electrode at a fixed distance in sequence, so that an electric field (bit) value signal acquired by the electrode at a fixed point position is effectively transmitted to a data receiver through a lead; the mode that a single lead is connected with a single electrode for data acquisition in the prior art is greatly simplified, the field working efficiency is effectively improved, and the engineering cost is saved. The utility model further discloses a data acquisition system adopting the integrated electrode arrangement.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas fracturing monitoring, in particular to an integrated electrode arrangement and data acquisition system for fracturing monitoring. Background Art

[0002] Fracturing crack monitoring technology refers to the real-time monitoring and testing and evaluation of the entire fracturing process of coalbed methane, oil, shale gas, etc. through certain instruments and technical means. Through data processing, the direction, length, width, height, fracturing fluid affected area, predicted production, calculated fracturing benefits, etc. of the cracks are obtained, thereby evaluating the fracturing effect. Traditional microseismic monitoring methods are difficult to achieve the desired monitoring effect due to the divergence of data points. In recent years, electrical fracturing monitoring methods based on the potential difference between fracturing wells and ground monitoring sites are gradually emerging. Electrical fracturing monitoring methods require the deployment of a large number of observation electrodes in a limited area near the wellhead. Each electrode needs to be connected to a data receiver through a lead. The large number of wiring connections can easily confuse the specific electrode point numbers corresponding to each line, requiring a large number of markings, which is time-consuming and labor-intensive. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art solutions, the utility model provides an integrated electrode arrangement and data acquisition system for fracturing monitoring.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An integrated electrode arrangement for fracturing monitoring includes: an arrangement line formed by bundling at least two conductive wires; electrodes having the same number as the conductive wires of the arrangement line; and each of the at least two conductive wires has an independent characteristic representation, and the electrodes are respectively connected to specific conductive wires in the arrangement order.

[0006] As a preferred embodiment, the arrangement line is formed by a bundle of 8 conductive lines, and the independent features are represented by colors.

[0007] As a preferred embodiment, the integrated electrode arrangement further comprises leads having a structure consistent with the arrangement line, and the integrated electrode arrangement is connected to the electrical receiver via the leads.

[0008] As a preferred embodiment, the integrated electrode arrangement further comprises an insulating wrapping layer having the same number as the conductive wires of the arrangement line, for wrapping the connection points between the electrodes and the conductive wires, and the insulating wrapping layer has a specific color indication.

[0009] As a preferred embodiment, the arrangement spacing of the electrodes is greater than the design spacing of the observation system.

[0010] As a preferred embodiment, the electrode is a copper electrode, one end of which is spike-shaped and the other end is provided with a small hole, and the electrode is connected to the conductive wire via a copper wire.

[0011] On the other hand, the utility model provides an electrical data acquisition system based on the above-mentioned integrated electrode arrangement, comprising: an electrical receiver; at least two electrode arrangements distributed on both sides of the fracturing well, the arrangement adopts the above-mentioned electrical integrated electrode arrangement; the electrode arrangement is connected to the signal acquisition channel of the electrical receiver.

[0012] Beneficial effects of the utility model:

[0013] The integrated electrode arrangement for fracturing monitoring provided by the utility model is achieved by bundling multiple conductive wires into one, and by giving each conductive wire a characteristic representation so as to connect with the electrodes at a fixed distance in sequence, and then effectively transmitting the electric field (position) value signal collected by the fixed-point electrode to a data receiver through the lead wire, which greatly simplifies the previous method of using a single lead wire to connect a single electrode for data collection in the field, effectively improves field work efficiency, and saves engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A side view of the integrated electrode arrangement is shown;

[0015] Figure 2 A cross-sectional view of an arrangement line connecting electrodes is shown;

[0016] Figure 3 A schematic diagram of the electrode wiring sequence is shown;

[0017] Figure 4 A cross-sectional view of the electrode is shown;

[0018] Figure 5 A schematic diagram of the on-site layout of the integrated electrode arrangement is shown. DETAILED DESCRIPTION

[0019] The utility model is described in detail below in conjunction with the accompanying drawings.

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] Example 1

[0022] This embodiment provides an integrated electrode arrangement for fracturing monitoring, such as Figure 1-3As shown, it includes: an arrangement line formed by a bundle of 8 conductive wires; 8 electrodes equal to the number of conductive wires in the arrangement line; and each of the 8 conductive wires has an independent color characteristic representation, and the electrodes are respectively connected to the conductive wires of specific colors in the arrangement order of numbers 1-8.

[0023] See also Figure 2 The eight conductive wires are represented by eight colors, namely orange-white, orange, green-white, green, blue-white, blue, brown-white, and brown. Among them, orange-white, green-white, blue-white, and brown-white are composite colors, so the classification and recognition of a large number of conductive wire colors are realized through the four main colors and their composite colors with white.

[0024] The integrated electrode arrangement further comprises leads which are consistent with the arrangement line structure and serve as extension carriers for data transmission. The integrated electrode arrangement is connected to the electrical receiver via the leads.

[0025] The integrated electrode arrangement also includes an insulating wrapping layer equal to the number of conductive wires of the arrangement line, which is used to wrap the connection points of the electrode and the conductive wire, and the insulating wrapping layer has a specific color indication. The insulating wrapping layer can be made of electrical tape, which is used for fixing and insulating the wiring, including the connection between the copper wire and the electrode and the contact between the copper wire and the arrangement line, so as to facilitate the identification of the electrode binding position. The specific color indication is a unified color indication (such as red or blue), or a color indication consistent with the independent color characteristics of the conductive wire (such as orange-white, orange, green-white, green, blue-white, blue, brown-white, brown). Therefore, the mapping relationship between the conductive wire and the electrode is not only reflected at the signal connection level, but also can reflect the measurement channel corresponding to the current electrode from the appearance of the integrated electrode arrangement, which is convenient for on-site troubleshooting of wiring faults. The copper wire is generally 60cm long, and the cable sheath is red for easy identification. The copper wire serves to connect the electrode and the arrangement line.

[0026] See also Figure 4 , the electrode is connected to the conductive wire via a copper wire. There are 8 electrodes, which are cylindrical, made of copper, 50 cm long, 5 cm in diameter, with a spike at one end and a small hole with a diameter of 1 cm at the other end, 5 cm away from the top. The electrode is made of copper and is solid as a whole. Copper has low resistivity and good conductivity. During the measurement process, the electrode is buried underground and leveled with soil all around to form a good contact with the earth, which supports the collection of point electric field values. The connection between the copper wire and the electrode is through the small hole on the electrode, and then it is bound around the electrode twice, fixed and insulated with insulating tape, which plays the role of connecting the arrangement line and the electrode.

[0027] The copper wire and the arrangement wire are connected according to different colors and fixed with electrical tape after connection. The copper wire and the arrangement wire are connected in the order of orange-white, orange, green-white, green, blue-white, blue, brown-white, and brown. The eight colors correspond to the eight electrodes one by one. The interval at the electrode connection is 17m, and the remaining length at both ends is 15m. Electrode 1 is connected at 15m, corresponding to the orange-white wire, and then electrode 2 is connected at 32m, corresponding to the orange wire, and so on, until finally connecting electrode 8 at 134m, corresponding to the brown wire, with a total wire length of 149m. Preferably, the arrangement spacing of the electrodes is 1.5~2 times the design spacing of the observation system. For example, the design spacing (point spacing) is 10 meters, and the arrangement spacing is 15~20 meters. This embodiment adopts 17m.

[0028] See also Figure 5 On the other hand, this embodiment provides an electrical data acquisition system based on the above-mentioned integrated electrode arrangement, including: an electrical receiver; at least two electrode arrangements distributed on both sides of the fracturing well, the arrangement adopts the above-mentioned electrical integrated electrode arrangement; the electrode arrangement is connected to the signal acquisition channel of the electrical receiver.

[0029] In the actual acquisition process, we laid out the integrated arrangement line structure at 150m on both sides of the well trajectory, divided into L1 line and L2 line, set points in sequence according to the well trajectory, numbered each point, and each point was separated by 10m. The spacing between the arrangement lines was 17m in order to have more redundancy to adapt to the complex geological conditions on site. According to the well trajectory, a total of 4 arrangement lines were laid out, with a total of 32 acquisition points, which can monitor a 150-long well section. The number of arrangements can be arranged according to the actual length of the well trajectory. In comparison, it can be found that if the integrated electrode arrangement line structure is not used, 32 leads are required to transmit the data of the electrode points to the receiving instrument. This is not only a huge workload, but also very complicated to identify the number of each point, which is prone to errors. The integrated electrode arrangement line structure only needs 4 leads to connect it to the receiving instrument with 4 arrangements. Compared with the method of pulling leads according to the electrodes, the number of leads is greatly reduced, saving costs and improving efficiency.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated electrode arrangement for fracturing monitoring, characterized in that: include: An arrangement line formed by bundling at least two conductive lines; The number of electrodes is equal to the number of conductive lines of the arrangement line; and Each of the at least two conductive lines has an independent characteristic representation, and the electrodes are respectively connected to specific conductive lines according to the arrangement order.

2. The integrated electrode arrangement according to claim 1, characterized in that: The arrangement line consists of 8 The conductive lines are bundled to form a structure, and the individual features are represented as colors.

3. The integrated electrode arrangement according to claim 2, characterized in that: The 8 conductive wires It is represented by 8 colors: orange-white, orange, green-white, green, blue-white, blue, brown-white, and brown.

4. The integrated electrode arrangement according to claim 2, characterized in that: Also included is the row The integrated electrode array is connected to an electrical receiver via leads having a consistent column line structure.

5. The integrated electrode arrangement according to claim 2, characterized in that: It also includes an insulating wrapping layer having the same number as the conductive wires of the arrangement line, which is used to wrap the connection points between the electrodes and the conductive wires, and the insulating wrapping layer has a specific color indication.

6. The integrated electrode arrangement according to claim 2, characterized in that: The specific color The indication is a uniform color indication, or a color indication consistent with the independent color characteristics of the conductive line.

7. The integrated electrode arrangement according to claim 2, characterized in that: The arrangement of the electrodes The spacing is larger than the design spacing of the observing system.

8. The integrated electrode arrangement according to claim 1, characterized in that: The electrode is a copper electrode The electrode has a spike-like end and a small hole at the other end, and the electrode is connected to the conductive wire via a copper wire.

9. An electrical data acquisition system for fracturing monitoring, characterized in that: include: Electrical receiver; At least two electrode arrangements distributed on both sides of the fracturing well, wherein the arrangement adopts the integrated electrode arrangement described in claims 2-8; The electrode arrangement is connected to a signal acquisition channel of the electrical receiver.

10. The data acquisition system according to claim 9, characterized in that: It comprises two integrated electrode arrangements distributed on both sides of the fracturing well, wherein the arrangement spacing of the electrodes is 1.5 to 2 times the design spacing of the observation system.

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